JP2001047918A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the motion of the waists of occupants and prevent the forward movement of the occupants in vehicular collision. SOLUTION: The seat for vehicles prevents occupants from moving forward due to inertia force when a vehicle collides. In this case, the seat comprises a seat face pushing up member 16 to buildup a seat cushion seat face 11a at a position corresponding to the position just before the pelvis of the occupant who sits, a drive means 17 to move the seat face pushing up member 16 upward and a control section 18 which controls the operation of the drive means 17 based on the change in the acceleration of a car body when the vehicle collides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat suitable for restraining an occupant's waist in a vehicle collision.

[0002]

2. Description of the Related Art At the time of a vehicle collision, an occupant is restrained by, for example, a seat belt so that the occupant does not move forward due to inertial force. The state of this restriction will be described with reference to the next figure. FIG.
(A), (b) is explanatory drawing explaining the restraint state of the conventional seatbelt. (A), the occupant 100 is seat 10
1 shows a state in which the user sits on the seat belt 1 and wears a seat belt 104 including a waist belt 102 and a shoulder belt 103 and depresses a brake pedal 105 at the time of a collision. At this time, crew 1
00 is securely restrained by the seat belt 104.

[0003] In (b), for example, when the collision is severe or the seat back 106 constituting the seat 101 is greatly inclined, the occupant 100 falls out from under the waist belt 102 due to the inertial force acting on the occupant 100. 1
In some cases, a phenomenon (submarine phenomenon) may occur in which the user moves forward while sliding on the seat cushion 107 constituting the seat 01 and falls under the instrument panel 108.

As a vehicle seat for preventing such a phenomenon, for example, Japanese Patent Application Laid-Open No. 9-71167, entitled "Vehicle Seat", and US Pat. No. 5,695,242, entitled "Seat Cushion Rest System""
Are known.

FIG. 9 of the publication discloses that the seat cushion 20 is tilted forward and upward around the axis of the torsion bar 10 at the time of a collision so that an occupant seated and wearing a seat belt 70 does not move forward. Sheet 1 is described. In the above technique, an airbag device 13 is provided below the front part 14 of the seat cushion 11 in FIG.
3 describes a seat 10 in which a front part 14 is raised to prevent an occupant from moving forward.

[0006]

In the above-mentioned technology, the seat cushion 20 is tilted upward, so that the occupant's leg, particularly a portion below the knee, is rapidly raised. Further, in the driver's seat, it is difficult to avoid a re-collision with respect to the re-collision after the collision because the foot separates from the brake pedal or the accelerator pedal. The same applies to the above technology when the front part 14 is raised.

[0007] Therefore, an object of the present invention is to provide a vehicle in the event of a vehicle collision.
An object of the present invention is to provide a vehicle seat that prevents an occupant from moving forward, prevents a sudden rise of a leg, and also avoids re-collision.

[0008]

According to one aspect of the present invention, there is provided a vehicle seat for preventing an occupant from moving forward due to an inertial force at the time of a vehicle collision, in a position immediately before a pelvis of a seated occupant. A seating surface pushing-up member for raising a seat cushion seating surface corresponding to the vehicle, a driving means for raising the seating surface pushing-up member, and control for controlling the operation of the driving means based on a change in vehicle body acceleration at the time of a collision. Department.

At the time of a vehicle collision, the control unit controls the operation of the driving means based on the change in the acceleration of the vehicle body, raises the seating surface pushing member by the driving means, and immediately before the pelvis of the occupant seated by the seating surface pushing member. The seat cushion seating surface corresponding to the position is raised to restrain the position immediately before the pelvis of the occupant.

As a result, the movement of the occupant's waist at the time of a vehicle collision can be suppressed, and the occupant can be prevented from moving forward. In addition, since the movement of the occupant's waist is suppressed, the occupant's posture is stabilized, and since the occupant's legs cannot be jumped up unlike the conventional case, the foot does not separate from the pedal, so the pedal The operation can be performed reliably, and re-collision can be avoided.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view of a vehicle seat according to the present invention. A seat 10 includes a seat cushion 11 on which an occupant sits, a seat back 12 for resting, and an upper portion of the seat back 12 for receiving the head of the occupant. And a headrest 13 attached to the headrest. In addition, 11a is a seating surface of the seat cushion 11. The seat cushion 11
A seating surface protruding device 15 for restraining the waist of a seated occupant is provided inside.

FIG. 2 is a perspective view showing the interior of the seat cushion of the vehicle seat according to the present invention. Seating surface protruding device 1
5 is a seating surface 11 of the seat cushion 11 (see FIG. 1).
a (see FIG. 1), a seating surface pushing-up member 16 for raising the seating surface, drive means 17, 17 for raising the seating surface pushing-up member 16, and the operation of the driving means 17, 17 are used to determine the vehicle body acceleration at the time of collision. And a control unit 18 for controlling based on the change. In addition, 19 is a cushion spring.

The seating surface push-up member 16 includes bases 23 attached to the projections 22 of the seat tray 21.
A pipe arm 25 swingably attached to the base portions 23, 23 via support shafts 24, 24; and a spring provided in the base portions 23, 23 for lowering the rear portion 25a side of the pipe arm 25. (Not shown, which will be described later). Reference numerals 23a, 23a denote stoppers provided on the base portions 23, 23 for regulating the maximum swing position of the rear portion 25a of the pipe arm 25.

The swing range of the rear portion 25 a of the pipe arm 25 is regulated by the convex portions 22 of the sheet tray 21. As described above, the highly rigid convex portion 2 of the sheet tray 21 is used.
Since the seating surface pushing-up member 16 is mounted on the seating surfaces 2, 22, the force acting on the seating surface pushing-up member 16 can be sufficiently supported, and the thickness of the seat tray 21 can be reduced.

The driving means 17 comprises a cylinder 31, a piston (not shown) movably housed in the cylinder 31, and a wire 32 having one end attached to the piston and the other end attached to the front portion 25 b of the pipe arm 25. And a wire receiver 33 for receiving the middle of the wire 32 and an inflator 3 for sending high-pressure combustion gas into the cylinder 31.
4

The control unit 18 includes a vehicle acceleration sensor 37 for detecting vehicle acceleration, and an inflator 34 based on a vehicle acceleration signal AS from the vehicle acceleration sensor 37.
34, and a control unit 38 for igniting.

FIG. 3 is a cross-sectional view of the seat cushion of the vehicle seat according to the present invention. The seating surface protruding device 15 is disposed below a skin 41 of the seat cushion 11 and a pad 42 provided inside the skin 41. It was done. The pipe arm 25 is a member shaped like a letter when viewed from the side, and is a member in which the front portion 25b is arranged at a high position except during a vehicle collision.

The wire 32 is always in a stretched state except during a vehicle collision so that the operation of the pipe arm 25 is not delayed at the time of the vehicle collision. Wire receiver 3
Reference numeral 3 denotes a member in which a wire groove 44 for passing the wire 32 is formed, and the wire 32 slides in the wire groove 44.

This wire receiver 33 is, as described above,
The structure in which the wire 32 does not have to be slippery may be used.
2 may be a pulley around which the wire 32 moves smoothly. 45 lowers the rear portion 25a of the pipe arm 25 before the vehicle collision,
That is, the pipe arm 25 is attached to the convex portion 22 of the sheet tray 21.
Is a spring for pressing the rear part 25a of the spring.

The operation of the above-described seating surface protruding device 15 will be described below. FIG. 4 is an operation diagram illustrating the operation of the device for projecting a seating surface of a vehicle seat according to the present invention. When the vehicle collides, the control unit 38 is controlled based on the vehicle acceleration signal AS from the vehicle acceleration sensor 37 shown in FIG.
Causes the inflators 34, 34 to ignite. This allows
The explosive in the inflators 34, 34 burns. As a result, in FIG. 4, the combustion gas flows into the cylinder 31, and the piston in the cylinder 31 moves at high speed.

Along with this, the wire 32 attached to the piston is pulled, and the front part 25b of the pipe arm 25 is lowered. And the rear part 25a of the pipe arm 25 rises,
The pad 42 and the skin 41 are pushed up, and the seating surface 11a is raised by the height U.

FIG. 5 is an explanatory view for explaining the seating state of the occupant in the vehicle seat according to the present invention, and corresponds to the state of the seating surface projecting device 15 shown in FIG. The occupant's waist and upper body are restrained by a seat belt 48 including a waist belt 46 and a shoulder belt 47. Reference numeral 51 denotes an occupant's pelvis, and reference numeral 52 denotes a pubic bone constituting the pelvis 51.

The operation of the vehicle seat 10 described above will now be described. FIG. 6 is an operation view for explaining the operation of the vehicle seat according to the present invention, and the seating surface projecting device 1 shown in FIG.
This corresponds to the state of No. 5. When the seating surface protruding device 15 is activated by a vehicle collision, the seating surface 11a of the seat cushion 11 rises.

The raised portion A is a seat cushion seating surface corresponding to the pelvis 51 of the seated occupant, that is, the position immediately before the pubis 52. That is, the seating surface protruding device 15
The pelvis 51 of the occupant on the seat cushion seating surface 11a
To form a high-rigidity portion at a position immediately before.

As described above, according to the present invention, in a vehicle seat 10 for preventing an occupant from moving forward due to an inertial force at the time of a vehicle collision, a seat cushion seat corresponding to a position immediately before a pelvis 51 of a seated occupant is provided. The seating surface pushing-up member 16 shown in FIG. 2 for raising the surface 11a, and the driving means 1 for raising the seating surface pushing-up member 16
7 and a control unit 18 for controlling the operation of the driving means 17 based on the change in the vehicle body acceleration at the time of the collision.

According to the above configuration, in FIG. 6, the occupant's waist can be restrained by raising the seat cushion seating surface 11a at the time of a vehicle collision, thereby restraining the occupant's waist. Can be prevented. Accordingly, even if the collision is severe or the posture of the seat back 12 is increased before the collision, the submarine phenomenon such as sliding on the seat cushion 11 from below the waist belt 46 occurs. Can be prevented.

Also, since the movement of the occupant's waist is suppressed, the posture of the occupant is stabilized, and since the legs of the occupant cannot be jumped up unlike the conventional case, the foot does not leave the pedal. Therefore, pedal operation can be performed reliably, and re-collision can be avoided.

FIG. 7 is an explanatory view illustrating a comparative example of the seating surface protruding device. The seating surface protruding device 110 includes a base portion 112 attached to a seat tray 111 and a base portion 11.
2 and a pipe arm 114 rotatably mounted via a support shaft 113 to the front part 115 of the pipe arm 114.
This raises the seating surface 117 of the seat cushion 116. That is, the seating surface projecting device 110 moves the support shaft 113, which is the rotation center of the pipe arm 114, to the seating surface 11
7 is arranged rearward of the front part 115 that raises the height.

In this comparative example, the occupant sends the pipe arm 1
When a forward force F acts on the front portion 115 of the pipe arm 14, the bent portion of the pipe arm 114 (the support shaft 113) is generated by the force F.
), Which is disadvantageous for restraining the occupant's waist. Also, the front part 11 of the pipe arm 114
After flipping up 5, a special holding member is needed to keep its position.

In contrast to the above comparative example, the seating surface projecting device 15 of the present invention shown in FIG. 6 uses the support shaft 24, which is the center of rotation of the pipe arm 25, for the rear portion 25 that raises the seating surface 11a.
It is arranged ahead of a. In the present invention, FIG.
As shown in FIG.
a, a forward force F acts on the base portion 2.
3 can be received by the stopper 23a, and the deformation of the pipe arm 25 can be suppressed. Also, the stopper 23
By providing “a”, a special holding member for keeping the position after the pipe arm 25 is flipped up is unnecessary.

By arranging the support shaft 24 in front of the rear portion 25a of the pipe arm 25 of the seating surface protruding device 15 as described above, the force acting on the pipe arm 25 from the occupant at the time of a collision restrains the occupant's waist. Can be further strengthened, which is preferable.

FIG. 8 is a perspective view showing another embodiment of the device for projecting a seating surface of a vehicle seat according to the present invention. The device 60 for projecting a seating surface includes a fixed shaft 6 attached to a seat tray 61.
2 and a pulley 6 rotatably mounted on the fixed shaft 62
3, 63, and brackets 6 on these pulleys 63, 63.
4 and 64, a pipe arm 65 attached through the pulleys 63, 63, and wires 66, 66 wound around the pulleys 63, 63;
6 and 66 for drawing in the cylinders. The inflator for supplying the combustion gas to the cylinders 67, 67 and the control unit for igniting the inflator are the same as those described with reference to FIG.

When the vehicle collides, the cylinders 67, 6
The high pressure fuel gas supplied into the cylinder 7
The piston (not shown) in 7, 67 moves, and the wire 66,
The pull-in 66 rotates the pulleys 63, 63 to swing the pipe arm 65 from the position indicated by the imaginary line to the position indicated by the solid line, and the seat cushion 11 shown in FIG.
Of the seating surface 11a is raised.

FIG. 9 is a perspective view showing a modification of another embodiment (an example of FIG. 8) of the seating surface projecting device for a vehicle seat according to the present invention. This is a device in which the positions of the cylinders 67, 67 are changed from the front position of the fixed shaft 62 to the rear position with respect to the seating surface protruding device 60 shown.

FIG. 10 is a perspective view showing still another embodiment of the device for projecting a seating surface of a vehicle seat according to the present invention.
Cylinders 73, 73 (the back side reference numeral 73 is not shown) provided in the cylinders 2, 72, respectively, and a main wire 74 passed between respective pistons (not shown) movably housed in the cylinders 73, 73. The portion of the main wire 74 closer to the outside than the center portion and the side wall 72 of the sheet tray 71,
72, and wire lock portions 76, 76 attached to the side walls 72, 72 near the cylinders 73, 73, respectively. Reference numeral 77 denotes a collar covering the central portion of the main wire 74.

Here, an inflator for supplying combustion gas to the cylinders 73 and 73 and a control unit for igniting the inflator are the same as those described with reference to FIG. 2, and a description thereof will be omitted. The illustrated seating surface protruding device 70 is in a state before the operation, and the main wire 74 and the sub-wires 75 are in a slack state.

FIG. 11 is an operation view of still another embodiment (an example of FIG. 10) of the device for projecting a seating surface of a vehicle seat according to the present invention. When the vehicle collides with the seating surface protruding device 70, high-pressure combustion gas is supplied to the cylinders 73, 73. Thereby, each piston in the cylinders 73, 73 moves at high speed, and accordingly, the pistons stretch the main wire 74 and the sub-wires 75, 75. As a result, the seating surface 1 of the seat cushion 11 shown in FIG.
Raise 1a.

FIGS. 12A and 12B are sectional views of the wire lock portion shown in FIG. (A) shows a state immediately after the main wire 74 is stretched. Wire lock section 76
Is a side wall 72 (see FIG. 1) of the sheet tray 71 (see FIG. 11).
1), a support shaft 82 mounted on the case 81, a roller member 83 rotatably mounted on the support shaft 82 and hung with a main wire 74,
Movable teeth 84 are attached to the roller member 83, fixed teeth 85 are fixed to the case 81 so as to be paired with the movable teeth 84 and bit the main wire 74, and stoppers 86 for the movable teeth 84. .

In (b), after the main wire 74 is stretched, a force from the occupant acts on the central portion of the main wire 74 and the main wire 74 is pulled inward. 84 engages the main wire 74 with the fixed teeth 85. Thereby, the main wire 74 is locked, and the slack of the main wire 74 can be prevented.

In the present invention, as shown in FIG. 2, the seating surface pushing-up member 16 has a structure in which the pipe arm 25 is swung. However, the present invention is not limited to this. It may be moved, the cam-shaped member can be rotated, or the spherical member can be moved up and down. In short, it is only necessary to raise the seating surface 11a (see FIG. 3).

In the present invention, the driving means 17
Although the combination of the cylinder 31 and the inflator 34 has been described as an example, the invention is not limited to this. For example, the combination may be driven by an electromagnet, or driven by supplying a high-pressure gas from a gas tank or an accumulator.

[0042]

According to the present invention, the following effects are exhibited by the above configuration. The seat for a vehicle according to claim 1 is a seating surface pushing-up member for raising a seat cushion seating surface corresponding to a position immediately in front of a pelvis of a seated occupant, driving means for raising the seating surface pushing-up member, and driving Since the control unit controls the operation of the means based on the change in the vehicle body acceleration at the time of the collision, the movement of the occupant's waist at the time of the vehicle collision can be suppressed, and the occupant can be prevented from moving forward.

Also, since the movement of the occupant's waist is suppressed, the occupant's posture is stabilized, and since the occupant's legs cannot be jumped up unlike the related art, the foot does not leave the pedal. Therefore, pedal operation can be performed reliably, and re-collision can be avoided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle seat according to the present invention.

FIG. 2 is a perspective view showing the inside of a seat cushion of the vehicle seat according to the present invention.

FIG. 3 is a sectional view of a seat cushion of the vehicle seat according to the present invention.

FIG. 4 is an operational view illustrating the operation of the device for projecting a seating surface of a vehicle seat according to the present invention.

FIG. 5 is an explanatory view illustrating a seated state of an occupant in the vehicle seat according to the present invention.

FIG. 6 is an operation diagram illustrating the operation of the vehicle seat according to the present invention.

FIG. 7 is an explanatory view illustrating a comparative example of the seating surface protruding device.

FIG. 8 is a perspective view showing another embodiment of the device for projecting a seating surface of a vehicle seat according to the present invention.

FIG. 9 is a perspective view showing a modified example of another embodiment (an example of FIG. 8) of the vehicular seat protruding device according to the present invention.

FIG. 10 is a perspective view showing still another embodiment of the device for projecting a seating surface of a vehicle seat according to the present invention.

FIG. 11 is an operational view of still another embodiment (an example of FIG. 10) of the device for projecting a seating surface of a vehicle seat according to the present invention.

FIG. 12 is a sectional view of the wire lock unit shown in FIG. 11;

[Explanation of symbols]

10 ... Vehicle seat, 11 ... Seat cushion, 11a
... seat cushion seating surface, 15, 60, 69, 70 ...
Seating surface protruding device, 16: seating surface pushing-up member, 17: drive means, 18: control unit, 51: pelvis.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 9, 1999 (1999.8.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Added

[Correction contents]

FIG. 13 is an explanatory view for explaining a restrained state of a conventional seat belt.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Added

[Correction contents]

FIG. 13

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yutaka Okamoto 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (Reference) 3B087 CD02 DB03 DE08

Claims (1)

[Claims] 1. A vehicle seat for preventing an occupant from moving forward due to inertial force at the time of a vehicle collision, comprising: a seating surface push-up member for raising a seat cushion seating surface corresponding to a position immediately in front of a pelvis of a seated occupant; And a control unit for controlling the operation of the driving means based on a change in vehicle acceleration at the time of a collision.